Crowbar attachment



April 17, 1928. 1,666,842

E. 'C. CARLSON CROWBAR ATTACHMENT Fi led Dec. 4'. 1926 Inventor E'har 6 (rzsorz.

Attorney lse the use of the crow be seen that Patented Apr. 17, 1928.

UNITED STATES EINAB C. CARLSON, 01' TWO HABBOBS, MINNESOTA.

OROWBAR ATTACHMENT.

Application filed December 4, 1926. Serial No. 152,645. g

The present invention relatesto a crow bar attachment andFaimsto provide a device whereby a. crow bar may be efficiently used for digging holes such as "are incident to the digging of wells or telephone post holes.- The attachment is particularly adapted to bar' inbreaking up the hard clay or rock whether large or small. At the present time it is very difficult to loosen u the clay and rocks -in'the bottom of holes eing dugfor the purpose specified and this implement overcomes this diflicult task to a considerable extent,

Another important object of the invention lies in the provision of an attachment of this nature which allows the crow bar to be used as a jack for lifting. and prying heavy things. I

A still further very important object of the invention lies in the provision of an attachment of thisnature which is simple in its construction, adjustable, thoroughly efficient and reliable, compact and convenient, and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in cor tain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed. i

In the drawing:

' Figure 1 is a perspective view of the attachment embodying vention,

Fig. 2 is a thereof,

Fig. 3 is an elevation of the attachment showing the same in use,

Fig. 4 is anelevation showing the attachment folded out of use. i

Referring to the drawing in detail it will the numeral 5 denotes a plate preferably in the form of a disk having a radially extendin'g notch or slot 6.' A crank 7 extends centrally from the disk plate 5 and is fixed thereto by means of cars 8 which are riveted as at 9 to the plate although any other fastening means may be utilized. This bar or shank 7 is provided with a lonthe features of my inperspective view of'a portion gitudinally extending series of transverse. apertures 10. A second shank 11 is pro-' vlded with longitudinal side which overhang the shank 11 and form a may be adjusted as flanges 12 sleeve in which is slidable the first shank 7. A screw, bolt, or like "fastening element 14 is threaded through an opening in the shank 11 and engages in the Epertures 10 for holdingthe shank 7 and 11 adjusted in relation to each other so that the shank formed by these two telescopically, associated shanks may be adjusted as to length.

The numeral 15 denotes a clamp section of arcuate formation having its terminals provided with oppositely extending ears 16 and its intermediate portion provided with a l'ug 17 from whichextends a pin 18 that pierces a suitable opening provided in the extremity of the shank 11. A coil spring 19 is isposed about the pin 18 between the shank 11 and a washer 20 on held in place by a cotter pin 21. An arcuate clamp section 22 is also provided with cars 23 which are adjustable with ears 16 by meansof screws, bolts, or like fastening elements 24. A crow bar 26 is adapted to be received in the clainp and this,clamp may be engaged with the crow bar at any point thereof which may be convenient but 1s pref-- the end of the pin 18" against the bank as shown in Fig. 3 in order a that the;.bottom of a well or hole may be worked so that the clay, rock, and the like may be more easily loosened. It will be obvious that the crow bar may be used as a prying instrument for raising devices such as a jack and in other useful ways by means of thisattachment. The shank of the device may be found necessary from time to time. When the attachment is not in use, it may be folded to-the out-- of-the-way position shown in Fig. 4 at which time the crow radial notch or'slot 6. The spring 19 Wlll hold the attachment in this position as this spring gives'the necessary friction between the lug 17 and the shank 11.

It is thought that the construction, operation, and utility of this invention will now be clearl understood by art wit out a more thereof; The preferred embodiment of the invention has been disclosed in detail merely by wayof example since in actual practice bar will extend through the.

those skilled in this detailed. description it attains the features of advantage enumerconstruction, and in the combination and ar-' 'rangement of parts may be resorted to Without departing the invention as hereinafter claimed or 5 sacrificing any of its advantages.

Having thus described my invention what I claim as new is:

An attachment of the class described including a late provided with a radial notch, 10 a shank xed to the plate and extending from the spirit and scope of,

ment.

slidable on th tions in relation to each means for pivoting the clam on the second shank, and spring means ho ding the clamp and the second shank in frictional engage- ;In testimony whereof I aflix m si ature. EINAR C. y gn CARLSON.

e first shank, means for hold-" mg the shanks at different adjustable posiother, a clamp, 

